I have no problem covering square cakes in fondant, its when it is just a plain buttercream cake that it is actually harder for me. I find it harder to ice a clean line at the corners than when doing a round cake you just keep going around and you dont have to worry about smooth corners, just one smooth edge at the top.

I find square cakes easier too - fondant or BC. With fondant, I start with the corners, as does Sugarshack in her videos. I think some people struggle with them because they can't always get sharp corners with fondant, in particular.

I was also hesitant to do square cakes - thought they'd be too much trouble but then for a wedding I HAD to get a square set (bride was insistent on square) I find them to be a pleasure to work with now although yes - if I was trying for sharp perfect corners (esp to match a dummy cake underneath) I'd totally stress out - haven't had to make a dummy yet though...

There is also a good video on youtube on how to fondant a square cake. The woman sounds Irish or Scottish, not that that has anything to do with it. LOL. She does a fantastic job, and she makes it look so easy.

Getting the edges and corners perfectly straight and sharp with BC is what I hate about square cakes. Covering in fondant is easy after watching Sugarshack do it. Isn't she the one with the accent in the You-Tube video?